scholarly journals Simultaneous measurement of displacement, strain and curvature in digital holographic interferometry using high-order instantaneous moments

2009 ◽  
Vol 17 (20) ◽  
pp. 17784 ◽  
Author(s):  
Sai Siva Gorthi ◽  
Pramod Rastogi
Keyword(s):  
Holographic Interferometry ◽  
Simultaneous Measurement ◽  
High Order

Simultaneous measurement of stress-optic constant and stress field of transparent plate by digital holographic interferometry

Optik ◽  
2016 ◽  
Vol 127 (24) ◽  
pp. 11974-11981 ◽  
Author(s):  
Haiting Xia ◽  
Rongxin Guo ◽  
Feng Yan ◽  
Heming Cheng ◽  
Zhiwei Lin ◽  
...  
Keyword(s):  
Stress Field ◽  
Holographic Interferometry ◽  
Simultaneous Measurement ◽  
Transparent Plate

Simultaneous Measurement of Out-of-Plane and In-Plane Displacements by Phase-Shifting Digital Holographic Interferometry

2006 ◽  
Vol 3-4 ◽  
pp. 223-228 ◽  
Author(s):  
S. Okazawa ◽  
Motoharu Fujigaki ◽  
Yoshiharu Morimoto ◽  
Toru Matui
Keyword(s):  
Phase Difference ◽  
Holographic Interferometry ◽  
Simultaneous Measurement ◽  
Phase Distribution ◽  
Complex Amplitude ◽  
Phase Shifting ◽  
Two Phase ◽  
Displacement Distribution ◽  
Before And After ◽  
Out Of Plane

In this paper, we apply phase-shifting digital holographic interferometry to simultaneous measurement for out-of-plane and in-plane displacements by employing two beam illuminations for an object. Phase-shifted holograms before and after displacements of the object using each of two beams are recorded by a CCD camera, separately. The complex amplitude at each pixel of the CCD plane is analyzed from the holograms taken with phase-shifting. The complex amplitude of he object is reconstructed from the complex amplitude distribution on the CCD plane using the Fresnel diffraction integral. Each directional phase difference distribution is obtained by calculating the phases before and after deformation for each directional beam. The phase distribution for out-of-plane displacements is obtained by calculating the sum of the two phase difference distributions. The phase distribution for in-plane displacements is obtained by calculating the difference of the two phase difference distributions. The phase values provide accurate displacement distribution information. Actually, when the object deforms in both out-of-plane and in-plane directions, it is possible to analyze the displacement distribution in each direction. The theory and an experiment are shown.

Determination of the Burgers vector of a dislocation in a Fe-Mn alloy by weak-beam image in HVEM

1978 ◽  
Vol 36 (1) ◽  
pp. 330-331
Author(s):  
Y. Ishida ◽  
H. Ishida ◽  
K. Kohra ◽  
H. Ichinose
Keyword(s):  
High Order ◽  
Simulation Technique ◽  
The Other ◽  
Image Simulation ◽  
Diffraction Vector ◽  
Burgers Vector ◽  
Weak Beam ◽  
Beam Image ◽  
Edge Component

IntroductionA simple and accurate technique to determine the Burgers vector of a dislocation has become feasible with the advent of HVEM. The conventional image vanishing technique(1) using Bragg conditions with the diffraction vector perpendicular to the Burgers vector suffers from various drawbacks; The dislocation image appears even when the g.b = 0 criterion is satisfied, if the edge component of the dislocation is large. On the other hand, the image disappears for certain high order diffractions even when g.b ≠ 0. Furthermore, the determination of the magnitude of the Burgers vector is not easy with the criterion. Recent image simulation technique is free from the ambiguities but require too many parameters for the computation. The weak-beam “fringe counting” technique investigated in the present study is immune from the problems. Even the magnitude of the Burgers vector is determined from the number of the terminating thickness fringes at the exit of the dislocation in wedge shaped foil surfaces.

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